Thermally Controlled Cyclic Insertion/Ejection of Dopant Ions and Reversible Zinc Blende/Wurtzite Phase Changes in ZnS Nanostructures

被引：92

作者：

Karan, Niladri S. ^{[2
]}

Sarkar, Suresh ^{[1
,2
]}

Sarma, D. D. ^{[3
]}

Kundu, Paromita ^{[4
]}

Ravishankar, N. ^{[4
]}

Pradhan, Narayan ^{[1
,2
]}

机构：

[1] Indian Assoc Cultivat Sci, Dept Mat Sci, Kolkata 700032, India

[2] Indian Assoc Cultivat Sci, Ctr Adv Mat, Kolkata 700032, India

[3] Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka, India

[4] Indian Inst Sci, Mat Res Ctr, Bangalore 560012, Karnataka, India

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2011年 / 133卷 / 06期

关键词：

OPTICAL-PROPERTIES; CDS NANOCRYSTALS; TRANSITION; WURTZITE; MN; TRANSFORMATION; MONODISPERSE; DEPENDENCE; LUMINESCENCE; MORPHOLOGY;

D O I：

10.1021/ja109625v

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report a reversible phase transformation of platelet-shaped ZnS nanostructures between wurtzite (WZ) and zinc blende (ZB) phases by reversible insertion/ ejection of dopant Mn(II) ions induced by a thermocyclic process. In a reaction flask loaded with WZ ZnS platelets and Mn molecular precursors, during heating Mn ions are incorporated and change the phase of the host nanostructures to ZB; during cooling Mn ions are spontaneously ejected, returning the host nanoplatelets to the original WZ phase. These reversible changes are monitored for several cycles with PL, EPR, XRD, and HRTEM. Interestingly, the (0001) WZ platelets transform to (110) ZB following a nucleation and growth process triggered by a local increase/depletion of the Mn2+ concentration in the nanocrystals.

引用

页码：1666 / 1669

页数：4

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